Sanctification of another's property is invalid: Bava Metzia 6a
Sanctification of disputed property which he Could/Couldn't gain control of in the courts: Bava Metzia 7a
Sanctification of disputed Territory which he Could gain control of in the courts: Bava Metzia 7a
Sanctification of an item which one stole, before the owner gives up hope of its return: Bava Metzia 7a